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mmc: core: Factor out mmc_host_set_uhs_voltage()
Factor out mmc_host_set_uhs_voltage() so it can be reused. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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@ -1672,11 +1672,33 @@ int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)
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}
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int mmc_host_set_uhs_voltage(struct mmc_host *host)
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{
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u32 clock;
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/*
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* During a signal voltage level switch, the clock must be gated
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* for 5 ms according to the SD spec
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*/
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clock = host->ios.clock;
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host->ios.clock = 0;
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mmc_set_ios(host);
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if (mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180))
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return -EAGAIN;
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/* Keep clock gated for at least 10 ms, though spec only says 5 ms */
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mmc_delay(10);
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host->ios.clock = clock;
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mmc_set_ios(host);
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return 0;
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}
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int mmc_set_uhs_voltage(struct mmc_host *host, u32 ocr)
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{
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struct mmc_command cmd = {};
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int err = 0;
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u32 clock;
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/*
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* If we cannot switch voltages, return failure so the caller
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@ -1708,15 +1730,8 @@ int mmc_set_uhs_voltage(struct mmc_host *host, u32 ocr)
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err = -EAGAIN;
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goto power_cycle;
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}
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/*
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* During a signal voltage level switch, the clock must be gated
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* for 5 ms according to the SD spec
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*/
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clock = host->ios.clock;
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host->ios.clock = 0;
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mmc_set_ios(host);
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if (mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180)) {
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if (mmc_host_set_uhs_voltage(host)) {
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/*
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* Voltages may not have been switched, but we've already
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* sent CMD11, so a power cycle is required anyway
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@ -1725,11 +1740,6 @@ int mmc_set_uhs_voltage(struct mmc_host *host, u32 ocr)
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goto power_cycle;
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}
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/* Keep clock gated for at least 10 ms, though spec only says 5 ms */
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mmc_delay(10);
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host->ios.clock = clock;
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mmc_set_ios(host);
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/* Wait for at least 1 ms according to spec */
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mmc_delay(1);
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@ -49,6 +49,7 @@ void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode);
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void mmc_set_bus_width(struct mmc_host *host, unsigned int width);
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u32 mmc_select_voltage(struct mmc_host *host, u32 ocr);
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int mmc_set_uhs_voltage(struct mmc_host *host, u32 ocr);
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int mmc_host_set_uhs_voltage(struct mmc_host *host);
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int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage);
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void mmc_set_timing(struct mmc_host *host, unsigned int timing);
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void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type);
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